it's going to be just enormous for our economy. >> it's the largest company in world's history, walmart. they sell more food than -- food -- than any company in the world. >> i had no idea. >> that's how massive it is. 1.6 million employees. >> i think this could really make a difference in our economy. we need it. >>> all right. coming up, what happens when two retirees head to prison with their knitting kits. >> we'll show you those doing hard time with needles and yarn. you can't miss that. stay tuned. you're watching "world news now." stay tuned. you're watching "world news now." ♪ >>> good musical choice, huh? good musical choice. >> good stuff. all right. when you think about criminals serving time behind bars, you probably figure they're pumping iron or shooting hoops. >> and knitting is probably the last thing that comes to mind. two retirees are turning convicts into converts with yarn. here's abc's t.j. winnick with more. >> reporter: barbed wire fences, watchman towers, and a group of men with felony convictions. >> armed kidnapping. >> attempted murder. >> reporter: but li